2

Example 2: On a particular day, the sales (in rupees) of different items of a baker's shop are given below.

ordinary bread : 320
fruit bread : 80
cakes and pastries : 160
biscuits : 120
others : 40
Total : 720

Draw a pie chart for this data.

Item	Sales (in ₹)	In Fraction	Central Angle (Calculation)
Ordinary Bread	320	320720 = 49 (22%)	49 × 360° = 160°
Biscuits	120	120720 = 16 (17%)	16 × 360° = 60°
Cakes and Pastries	160	160720 = 29 (22%)	29 × 360° = 80°
Fruit Bread	80	80720 = 19 (11%)	19 × 360° = 40°
Others	40	40720 = 118 (6%)	118 × 360° = 20°
Total	720		360° (Verified: 160° + 60° + 80° + 40° + 20° = 360°)

How to Draw a Pie Chart Manually

Follow these steps to draw the pie chart based on the sales data:

1. Calculate the Fraction of Total Sales: Divide the sales of each item by the total sales (720). For example, for Ordinary Bread:
   320720
   =
   49
   (22%).
2. Convert Fraction to Central Angle: Multiply the fraction by 360° (the total angle of a circle). For Ordinary Bread:
   49
   × 360° = 160°.
3. Draw the Circle: Use a compass to draw a circle of any convenient radius on a paper.
4. Mark the Center and Start Point: Mark the center of the circle and draw a radius to start (e.g., at 12 o'clock position).
5. Measure and Draw Angles: Use a protractor to measure each central angle from the starting radius:
   • Ordinary Bread: 160°
   • Biscuits: 60°
   • Cakes and Pastries: 80°
   • Fruit Bread: 40°
   • Others: 20°
   Draw radii to create sectors for each item.
6. Label the Sectors: Write the name of each item and its sales value inside or next to the corresponding sector.
7. Add a Legend (Optional): Create a key outside the circle to match colors or patterns to each item if using different shades.
8. Verify: Ensure the sum of all central angles is 360° to confirm the pie chart is complete.

Note: The angles in the pie chart below are already calculated and visualized for you!